US20130319081A1 - Gas concentration meter - Google Patents

Gas concentration meter Download PDF

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Publication number
US20130319081A1
US20130319081A1 US13/669,483 US201213669483A US2013319081A1 US 20130319081 A1 US20130319081 A1 US 20130319081A1 US 201213669483 A US201213669483 A US 201213669483A US 2013319081 A1 US2013319081 A1 US 2013319081A1
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United States
Prior art keywords
gas
gas concentration
meter
peripheral wall
annular peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/669,483
Inventor
Tony Cheng
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Biotest Medical Corp
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Biotest Medical Corp
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Assigned to BIOTEST MEDICAL CORPORATION reassignment BIOTEST MEDICAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, TONY
Publication of US20130319081A1 publication Critical patent/US20130319081A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/02—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
    • G01P5/06—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer using rotation of vanes

Definitions

  • the present invention relates to gas concentration measuring technology and more particularly, to a gas concentration meter, which uses the intake gas flow to rotate a fan blade, enabling a part of the intake gas flow to be steadily forced by the rotating fan blade into the inside of the meter so that measurement errors can be reduced.
  • gas sensors may be installed to in buildings to measure the concentration of carbon dioxide, making sure that indoor ventilation function is normal.
  • Conventional gas concentration measurement devices commonly comprise a meter and a detector head.
  • the gas to be measured enters the detector head by means of gas diffusion, and the detector head can then measure the concentration of the intake gas, enabling the measured data to be displayed on the meter.
  • this gas concentration measuring method is not suitable for measuring the concentration of a gas in a complex and highly variable flow field around the detector head, and can easily lead to measurement errors. Improvement in this regard is necessary.
  • the present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a gas concentration meter, which uses the intake gas flow to rotate a fan blade, enabling a part of the intake gas flow to be steadily guided into the inside of the meter so that measurement errors can be reduced.
  • a gas concentration meter comprises a meter body and a fan unit.
  • the meter body comprises a control circuit board and gas concentration sensor accommodated therein and electrically connected together, and a gas passage extending through the gas concentration sensor.
  • the gas passage has its one end terminating in an inlet, and its other end terminating in an outlet.
  • the fan unit is mounted at one side of the meter body, comprising an annular peripheral wall, and a fan blade rotatably mounted inside the annular peripheral wall. Further, the inlet of the gas passage extends to the inner side of the annular peripheral wall.
  • the invention avoids the interference of a complex flow field and improves the measurement accuracy.
  • a wind speed sensor is mounted inside the annular peripheral wall of the fan unit to measure the flow velocity during measurement of the gas concentration.
  • the wind speed sensor comprises an emitter and a receiver respectively disposed at two opposite sides relative to the fan blade.
  • FIG. 1 is an oblique front elevational view of a gas concentration meter in accordance with the present invention.
  • FIG. 2 is a longitudinal sectional view of the gas concentration meter in accordance with the present invention.
  • FIG. 3 is an elevational view of a part of the present invention, illustrating the arrangement of the blades of the fan unit.
  • the gas concentration meter 10 in accordance with the present invention is shown for measuring the gas concentration of a gas flow.
  • the gas concentration meter 10 comprises a meter body 20 , and a fan unit 30 disposed at one side of the meter body 20 .
  • the meter body 20 comprises a user interface 21 consisting of a screen and a set of operating keys, a control circuit board 22 accommodated therein, a gas concentration sensor 23 accommodated therein and electrically connected to the control circuit board 22 , and a gas passage 24 extending through the gas concentration sensor 23 .
  • the gas passage 24 as shown in FIG. 2 , has its one end terminating in an inlet 241 that is disposed in communication with the inside space of the fan unit 30 , and its other end terminating in an outlet 242 that is located on the outside wall of the meter body 20 far from the user interface 21 .
  • the fan unit 30 comprises an annular peripheral wall 31 , a fan blade 32 rotatably mounted inside the annular peripheral wall 31 , and a wind speed sensor 33 mounted inside the annular peripheral wall 31 .
  • the inlet 241 of the gas passage 24 extends to the inner side of the annular peripheral wall 31 .
  • the gas concentration sensor 23 can measure the concentration of one specific gas or multiple specific gases. Subject to different application requirements, the gas concentration sensor 23 can be designed to measure the concentration of, for example, but not limited to, oxygen, carbon monoxide, carbon dioxide, nitric oxide, nitrogen dioxide, hydrogen sulfide, hydrogen chloride, sulfur dioxide, hydrocarbons, ammonia and/or particles.
  • the gas concentration sensor 23 When a sample gas flow goes through the gas passage 24 , the gas concentration sensor 23 provides sensed data to the control circuit board 22 , enabling the data to be displayed on the screen of the user interface 21 .
  • the fan blade 32 of the fan unit 30 has a plurality of through holes 321 , as shown in FIG. 3 .
  • the wind speed sensor 33 comprises an emitter 331 and a receiver 332 respectively disposed at two opposite sides relative to the through holes 332 and electrically connected to the control circuit board 22 .
  • the emitter 331 emits infrared light that goes intermittently through the through holes 321 to the receiver 332 .
  • the control circuit board 22 calculates the rotational speed of the fan blade 32 , and then uses the data of the rotational speed of the fan blade 32 and the cross-sectional area of the annular peripheral wall 31 to calculate the flow velocity and flow rate of the gas flow.
  • the invention can effectively enhance the measuring accuracy and shorten the reaction time of the gas concentration sensor.
  • the wind speed sensor 33 can also measure the flow velocity of the gas flow for calculating the flow rate using the cross-sectional area of the annular peripheral wall 31 .

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

A gas concentration meter includes a meter body having a control circuit and a gas concentration sensor accommodated therein and electrically connected together said control circuit board and a gas passage extending through the gas concentrations sensor, and a fan unit mounted at one side of the meter body and having a fan blade rotatably mounted inside an annular peripheral wall thereof. The gas passage has its one end terminating in an inlet and extends to an inner side of the annular peripheral wall. When a gas flow goes through the fan unit to rotate the fan blade, a part of the gas flow will enter the inlet of the gas passage, enhancing measuring accuracy and shortening the reaction time of the gas concentration sensor. Further, a wind speed sensor may be provided to measure flow velocity.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to gas concentration measuring technology and more particularly, to a gas concentration meter, which uses the intake gas flow to rotate a fan blade, enabling a part of the intake gas flow to be steadily forced by the rotating fan blade into the inside of the meter so that measurement errors can be reduced.
  • 2. Description of the Related Art
  • Due to the need of modern city life and work, a lot of people are often gathered in one same building, easily leading to a dangerous high level of indoor carbon dioxide concentration Inhaling too much carbon dioxide will lead to a slowdown of the brain activities, unresponsiveness, or the state of drowsiness and lethargy. Therefore, gas sensors may be installed to in buildings to measure the concentration of carbon dioxide, making sure that indoor ventilation function is normal.
  • Conventional gas concentration measurement devices commonly comprise a meter and a detector head. When putting a gas concentration measurement device in the environment to be measured, the gas to be measured enters the detector head by means of gas diffusion, and the detector head can then measure the concentration of the intake gas, enabling the measured data to be displayed on the meter. However, this gas concentration measuring method is not suitable for measuring the concentration of a gas in a complex and highly variable flow field around the detector head, and can easily lead to measurement errors. Improvement in this regard is necessary.
    • SUMMARY OF THE INVENTION
  • The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a gas concentration meter, which uses the intake gas flow to rotate a fan blade, enabling a part of the intake gas flow to be steadily guided into the inside of the meter so that measurement errors can be reduced.
  • To achieve this and other objects of the present invention, a gas concentration meter comprises a meter body and a fan unit. The meter body comprises a control circuit board and gas concentration sensor accommodated therein and electrically connected together, and a gas passage extending through the gas concentration sensor. The gas passage has its one end terminating in an inlet, and its other end terminating in an outlet. The fan unit is mounted at one side of the meter body, comprising an annular peripheral wall, and a fan blade rotatably mounted inside the annular peripheral wall. Further, the inlet of the gas passage extends to the inner side of the annular peripheral wall.
  • Thus, when a gas flow goes through the fan unit to rotate the fan blade, a part of the gas flow will be forced by the rotating fan blade into the inlet of the gas passage. In addition to the advantage of faster inflow velocity than conventional gas diffusion, the invention avoids the interference of a complex flow field and improves the measurement accuracy.
  • Further, in one preferred embodiment of the present invention, a wind speed sensor is mounted inside the annular peripheral wall of the fan unit to measure the flow velocity during measurement of the gas concentration. The wind speed sensor comprises an emitter and a receiver respectively disposed at two opposite sides relative to the fan blade.
  • Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an oblique front elevational view of a gas concentration meter in accordance with the present invention.
  • FIG. 2 is a longitudinal sectional view of the gas concentration meter in accordance with the present invention.
  • FIG. 3 is an elevational view of a part of the present invention, illustrating the arrangement of the blades of the fan unit.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • Referring to FIGS. 1 and 2, a gas concentration meter 10 in accordance with the present invention is shown for measuring the gas concentration of a gas flow. The gas concentration meter 10 comprises a meter body 20, and a fan unit 30 disposed at one side of the meter body 20.
  • The meter body 20 comprises a user interface 21 consisting of a screen and a set of operating keys, a control circuit board 22 accommodated therein, a gas concentration sensor 23 accommodated therein and electrically connected to the control circuit board 22, and a gas passage 24 extending through the gas concentration sensor 23. The gas passage 24, as shown in FIG. 2, has its one end terminating in an inlet 241 that is disposed in communication with the inside space of the fan unit 30, and its other end terminating in an outlet 242 that is located on the outside wall of the meter body 20 far from the user interface 21.
  • The fan unit 30 comprises an annular peripheral wall 31, a fan blade 32 rotatably mounted inside the annular peripheral wall 31, and a wind speed sensor 33 mounted inside the annular peripheral wall 31. The inlet 241 of the gas passage 24 extends to the inner side of the annular peripheral wall 31. When a gas flow goes through the fan unit 30 to rotate the fan blade 32, a part of the gas flow will be forced by the rotating fan blade 32 toward the annular peripheral wall 31, and therefore a part of the gas flow will go into the inlet 241 of the gas passage 24 toward the gas concentration sensor 23 and then to the outside of the meter body 20 through the outlet 242.
  • The gas concentration sensor 23 can measure the concentration of one specific gas or multiple specific gases. Subject to different application requirements, the gas concentration sensor 23 can be designed to measure the concentration of, for example, but not limited to, oxygen, carbon monoxide, carbon dioxide, nitric oxide, nitrogen dioxide, hydrogen sulfide, hydrogen chloride, sulfur dioxide, hydrocarbons, ammonia and/or particles.
  • When a sample gas flow goes through the gas passage 24, the gas concentration sensor 23 provides sensed data to the control circuit board 22, enabling the data to be displayed on the screen of the user interface 21.
  • Further, the fan blade 32 of the fan unit 30 has a plurality of through holes 321, as shown in FIG. 3. Further, the wind speed sensor 33 comprises an emitter 331 and a receiver 332 respectively disposed at two opposite sides relative to the through holes 332 and electrically connected to the control circuit board 22. Thus, when the fan unit 32 is forced to rotate by a gas flow, the emitter 331 emits infrared light that goes intermittently through the through holes 321 to the receiver 332. Subject to the time interval of the infrared light passing through the fan blade 32, the control circuit board 22 calculates the rotational speed of the fan blade 32, and then uses the data of the rotational speed of the fan blade 32 and the cross-sectional area of the annular peripheral wall 31 to calculate the flow velocity and flow rate of the gas flow.
  • Based on the aforesaid structure, when the gas concentration meter 10 is placed indoors or in a gas exit, gas flow entering the fan unit 30 will rotate the fan blade 32, and a part of the intake gas flow will be forced by the rotating fan blade 32 into the gas passage 24, enabling the gas concentration sensor 23 to sense the concentration of a particular gas in the intake gas flow, and therefore, the invention can effectively enhance the measuring accuracy and shorten the reaction time of the gas concentration sensor. Further, in addition to gas concentration measurement, the wind speed sensor 33 can also measure the flow velocity of the gas flow for calculating the flow rate using the cross-sectional area of the annular peripheral wall 31. Thus, the practicality of the gas concentration meter 10 is enhanced.
  • Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.

Claims (5)

What is claimed is:
1. A gas concentration meter, comprising:
a meter body comprising a control circuit board accommodated therein, a gas concentration sensor accommodated therein and electrically connected to said control circuit board, and a gas passage extending through said gas concentrations sensor, said gas passage having one end thereof terminating in an inlet and an opposite end thereof terminating in an outlet; and
a fan unit mounted at one side of said meter body, said fan unit comprising an annular peripheral wall, and a fan blade rotatably mounted inside said annular peripheral wall;
wherein said inlet of said gas passage extends to an inner side of said annular peripheral wall.
2. The gas concentration meter as claimed in claim 1, further comprising a wind speed sensor mounted inside said annular peripheral wall of said fan unit.
3. The gas concentration meter as claimed in claim 2, wherein said fan blade comprises at least one through hole; said wind speed sensor comprising an emitter and a receiver disposed at two opposite sides relative to said at least one through hole of said fan blade and electrically connected to said control circuit board.
4. The gas concentration meter as claimed in claim 1, 2 or 3, wherein said meter body further comprises a user interface formed of a screen and a set of operating keys.
5. The gas concentration meter as claimed in claim 4, wherein said outlet of said gas passage is located on one side of said meter body far from said user interface.
US13/669,483 2012-06-04 2012-11-06 Gas concentration meter Abandoned US20130319081A1 (en)

Applications Claiming Priority (2)

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TW101210732 2012-06-04
TW101210732U TWM444585U (en) 2012-06-04 2012-06-04 Gas concentration detector

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160097555A1 (en) * 2014-10-03 2016-04-07 Weatherflow, Inc. Smartphone-operated hvac anemometer device and system
CN106214151A (en) * 2016-09-19 2016-12-14 米尔思维（北京）医疗科技有限公司 A kind of respiratory function test Apparatus and system
CN113358818A (en) * 2021-04-29 2021-09-07 浙江丰合检测技术股份有限公司 Industrial waste gas detection method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110161178B (en) * 2018-02-11 2023-12-26 艾欧史密斯(中国)热水器有限公司 Gas concentration detection device and detection method
CN110817890A (en) * 2019-11-08 2020-02-21 协鑫高科纳米新材料(徐州)有限公司 Deacidification drying furnace for production of fumed silica

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5869749A (en) * 1997-04-30 1999-02-09 Honeywell Inc. Micromachined integrated opto-flow gas/liquid sensor
US5926098A (en) * 1996-10-24 1999-07-20 Pittway Corporation Aspirated detector
US20010011473A1 (en) * 1998-07-23 2001-08-09 Marshall Stephen Edward Apparatus for determining odor levels in gas streams
US20040025604A1 (en) * 1999-03-10 2004-02-12 Mesosystems Technology, Inc. Optimizing rotary impact collectors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926098A (en) * 1996-10-24 1999-07-20 Pittway Corporation Aspirated detector
US6166648A (en) * 1996-10-24 2000-12-26 Pittway Corporation Aspirated detector
US5869749A (en) * 1997-04-30 1999-02-09 Honeywell Inc. Micromachined integrated opto-flow gas/liquid sensor
US20010011473A1 (en) * 1998-07-23 2001-08-09 Marshall Stephen Edward Apparatus for determining odor levels in gas streams
US20040025604A1 (en) * 1999-03-10 2004-02-12 Mesosystems Technology, Inc. Optimizing rotary impact collectors
US6951147B2 (en) * 1999-03-10 2005-10-04 Mesosystems Technology, Inc. Optimizing rotary impact collectors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160097555A1 (en) * 2014-10-03 2016-04-07 Weatherflow, Inc. Smartphone-operated hvac anemometer device and system
CN106214151A (en) * 2016-09-19 2016-12-14 米尔思维（北京）医疗科技有限公司 A kind of respiratory function test Apparatus and system
CN113358818A (en) * 2021-04-29 2021-09-07 浙江丰合检测技术股份有限公司 Industrial waste gas detection method

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AS Assignment

Owner name: BIOTEST MEDICAL CORPORATION, TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHENG, TONY;REEL/FRAME:029244/0106

Effective date: 20121024

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION